Problems saving ids in belongs_to relationship - ruby-on-rails

Question

I have 3 objects: users, travels, points.
A user has many travels, a travel has many points, a point belongs to one travel e one user.
A travel has also a boolean attribute (:open) which tells if is it in curse or not.
The problem is that I can't save "travel_id" of the current travel in my points table.
Here is the code:
class Point < ActiveRecord::Base
belongs_to :travel, :foreign_key=> "travel_id"
belongs_to :user, :foreign_key=> "user_id"
end
class Travel < ActiveRecord::Base
has_one :user, :foreign_key => "user_id"
has_many :ways
has_many :points
attr_accessible :description, :start_date, :last_date
validates_date :last_date, :on_or_after => :start_date
end
Points controller:
...
def create
#point = Point.new(params[:point])
#point.user_id = current_user.id
#travel = current_user.travels.find(:all, :conditions => {:open => true})
#point.travel_id = #travel.id
respond_to do |format|
if #point.save
format.html { redirect_to(#point, :notice => 'Point was successfully created.') }
format.xml { render :xml => #point, :status => :created, :location => #point }
else
format.html { render :action => "new" }
format.xml { render :xml => #point.errors, :status => :unprocessable_entity }
end
end
end
...
Every time I try to save a new point, #point.travel_id = -614747648

Answer 1

A few things could do with being fixed up here.
Firstly, you don't need to specify :foreign_key when the key is just the same as the relation name + _id.
Second, you don't need to (and generally shouldn't) set the foo_id fields directly; it's more usual to do #point.user = current_user.
Thirdly, and the direct cause of your problem, is that #travel has been set to the result of a find(:all, ...) call - so it's an Array of Travel objects. What you're saving into #point.travel_id will be Ruby's internal id for the #travel Array, rather than a database ID for a single row.